I have no idea what passwords from . csv.files are or where to find them on my Asus LinuxMint laptop?

 The only password and username that i entered into my LinuxLaptop  are the only usernames and passwords

that I've entered into my new computer. I've also entered my google Chrome username and password to set up my Thunderbird email service. I never wanted to sync all my usernames and passwords in my Acer laptop computer because I felt that that made it too simple for a hacker to access all of my personal Information and access to accounts. Mozilla Firefox wants a password for csv files or tsv files or HTML files ? I don' know what any of these files are or where to go to to find them or the passwords for these files. I just want to successfully transfer all of my Favorates folders and files then all my Documents and picture files to my new computer. I'm a Photography artist, Graphic Designer,abstract painter, and creative writer. I can't move forward in my creative pursuits without completing these tasks. Thanks very much for your help and information. I'm soon to be 80 years old and not a very good keypuncher on a computer. I'm happy to leave Microsoft Windows and Google behind but Linux Mint is all new to me.